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Behind the scenes: Photos from Fortune’s 40 Under 40 party

See members of our new 40 Under 40, like FitBit CEO James Park and Soulcycle CEO Melanie Whelan, party together last week at GitHub.

Fortune's 40 Under 40 Party

Each fall, two weeks or so after the release of our new 40 Under 40 list, Fortune toasts the new class at a big party in San Francisco, where many of the honorees are based.

We’ve held our event at the headquarters of buzzy tech startups like Zynga and Airbnb. This year, on October 7, the bash was at GitHub headquarters, hosted by GitHub’s CEO Chris Wanstrath, who made the new list. More than half of our new 40 showed up to party—below are some shots from the event. On first mention, we’ve identified new members of the list (as well as list alums) with their full titles and companies.

Take a look, and then look back at this year’s full 40 Under 40.

Fortune's 40 Under 40 Party
Virtru co-founder Will Ackerly, Soulcycle CEO Melanie Whelan, Bank of America managing director Karen Fang, Virtru CEO John Ackerly. Photograph by Drew Alitzer

Fortune's 40 Under 40 Party
Alan Murray, Alliance Consumer Growth partner Trevor Nelson, Karen Fang, FitBit CEO James Park. Photograph by Drew Alitzer

Facebook head of security Alex Stamos hits the photo booth. Photograph by Robyn Twomey

Fortune's 40 Under 40 Party
Daniel Roberts, Leigh Gallagher, Xiaomi Global VP Hugo Barra, Alan Murray. Photograph by Drew Alitzer

Fortune's 40 Under 40 Party
Adam Lashinsky, Ruth Kirschner, Ron Conway. Photograph by Drew Alitzer

Fortune's 40 Under 40 Party
Emil Michael, Shervin Pishevar, Scott Stanford, Eventbrite president Julia Hartz, Guest, Molly Graves, Uber head of global ops Ryan Graves. Photograph by Drew Alitzer

Fortune's 40 Under 40 Party
Daniel Roberts, Dollar Shave Club CEO Michael Dubin. Photograph by Drew Alitzer

Fortune's 40 Under 40 Party
Melanie Whelan, James Park. Photograph by Drew Alitzer

Fortune's 40 Under 40 Party
Alan Murray, Zenefits CEO Parker Conrad. Photograph by Drew Alitzer

Fortune's 40 Under 40 Party
OvaScience CEO Michelle Dipp, Kristin Rubi, GM treasurer Dhivya Suryadevara, Jeff Peck, S’well Bottle CEO Sarah Kauss. Photograph by Drew Alitzer

Fortune's 40 Under 40 Party
Brad Stone, James Park, Fidelity mutual fund trader Chuck Myers, Eric Stone. Photograph by Drew Alitzer

Fortune's 40 Under 40 Party
Melanie Whelan, Michal Lev-Ram, Karen Fang. Photograph by Drew Alitzer

Fortune's 40 Under 40 Party
Katie Stamos, Alex Stamos, Laura Swaminathan, Accenture Digital managing director Anand Swaminathan. Photograph by Drew Alitzer

Ryan Graves and his wife Molly. Photograph by Robyn Twomey

Fortune's 40 Under 40 Party
GitHub CEO Chris Wanstrath, Andrew Nusca, Jonathan Vanian. Photograph by Drew Alitzer

Fortune's 40 Under 40 Party
GoldieBlox CEO Debbie Sterling, Ling Wong. Photograph by Drew Alitzer

Fortune's 40 Under 40 Party
Alliance Consumer Growth partner Josh Goldin, Srishti Gupta, Novartis global head of development Vas Narasimhan. Photograph by Drew Alitzer

Karen Fang and Melanie Whelan. Photograph by Robyn Twomey

Fortune's 40 Under 40 Party
Laura Swaminathan, Anand Swaminathan, Michelle Dipp, James Park. Photograph by Drew Alitzer

For more Fortune photography follow us on Instagram at @fortunemag.